Slide 12: taurodont
Slide 13: cynodont (normal)
Slide 14: taurodont
Fusion, Gemination, Dilacertion & Concrescence
These conditions are illustrated in Slides #15 through #27
and require little comment.
Fusion
, the joining of two adjacent tooth germs to form a
single large tooth is seen in Slide #15. Notice the lateral
incisor is missing, it fused with the central incison.
Gemination
, an attempt by a single tooth germ to form
two teeth…twinning, seen in Slides #16 and #17.* It is not
always readily apparent if a large tooth is an example of
fusion or germination. If you have a problem, just count
the teeth. If one is missing it is fusion, if one is not miss-
ing, it is gemination.
Slide #18,
dilaceration
, an abnormal deviation (bend) in
the root of a tooth, presumably caused by traumatic dis-
placement during root development.
Slide # 19 is an example of
concrescence
, the fusion of cementum of adjacent teeth,
a good reason to have radiographs before extraction of a tooth.
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